<p>
    Runs a shell command of your choice to install the tool. Ubuntu example,
    assuming the Jenkins user is in <code>/etc/sudoers</code>:
</p>
<pre>sudo apt-get --yes install openjdk-6-jdk</pre>
<p>
    (In this case specify e.g. <code>/usr/lib/jvm/java-6-openjdk-i386</code> as the home directory.)
</p>
<p>
    As another example, to install an older version of Sun JDK 6 for (x86) Linux,
    you can use the obsolete <a href="http://jdk-distros.java.net/">DLJ</a>:
</p>
<pre>bin=jdk-6u13-dlj-linux-i586.bin
if [ \! -f $bin ]
then
    wget --no-verbose http://download.java.net/dlj/binaries/$bin
    sh $bin --unpack --accept-license
fi</pre>
<p>
    (In this case specify <code>jdk1.6.0_13</code> as the home directory.)
</p>
